CN103196212A - Indoor motor control circuit of brushless motor air-conditioning system - Google Patents
Indoor motor control circuit of brushless motor air-conditioning system Download PDFInfo
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- CN103196212A CN103196212A CN2013101365925A CN201310136592A CN103196212A CN 103196212 A CN103196212 A CN 103196212A CN 2013101365925 A CN2013101365925 A CN 2013101365925A CN 201310136592 A CN201310136592 A CN 201310136592A CN 103196212 A CN103196212 A CN 103196212A
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Abstract
The invention discloses an indoor motor control circuit of a brushless motor air-conditioning system. The indoor motor control circuit comprises a microcontroller U4, a motor speed control circuit of an indoor direct-current fan, an indoor motor speed regulation voltage cut-off circuit and a temperature detection circuit. The motor speed control circuit of the indoor direct-current fan and the temperature detection circuit are connected with the microcontroller, and the indoor motor speed regulation voltage cut-off circuit is connected with the motor speed control circuit of the indoor direct-current fan. The indoor motor speed regulation voltage cut-off circuit includes a first partial pressure shaping circuit, a first direct-current voltage detection circuit and a Vsp1 voltage cut-off circuit. The indoor motor control circuit of the brushless motor air-conditioning system has the advantages that speed of an indoor fan motor can be adjusted and controlled optionally, better heating effect can be achieved, and safety and reliability of the indoor motor in operation are improved and the like.
Description
Technical field
The present invention relates to a kind of brushless electric machine air-conditioning system indoor motor control circuit.
Background technology
The heating capacity of constant speed air-conditioning and the noise problem of alternating current generator are perplexing technical staff in the industry always, make the behaviour in service of fixed speed air conditioner not fully up to expectations.Existing fixed speed air conditioner, it is indoor, outdoor fan motor adopts AC induction motor mostly, and outdoor motor mostly is one grade of rotating speed control, though a stable rotating speed can be arranged under the rated power supply of 220V, 50Hz, but the variation along with voltage, fluctuation on a large scale also will appear in its rotating speed, and when causing line voltage high, the outdoor motor noise is excessive; And when line voltage was low, the outdoor motor rotating speed was low excessively, and radiating effect is poor.Though minority high energy efficiency fixed speed air conditioner blower fan has adopted dc brushless motor, often only outdoor fan motor adopts dc brushless motor, and its control is very simple, only provides a fixing driving voltage to direct current generator.Cause the electromagnetic sound of common fixed speed air conditioner heating effect and alternating current generator to be difficult to solve always, even the high energy efficiency constant speed air-conditioning of above-mentioned employing dc brushless motor also only is to promote to some extent on the whole efficiency of constant speed air-conditioning, and it is not fully up to expectations aspect heating effect, particularly high and low temperature heating effect, high temperature heats under the situation, owing to adopted the method control system load of opening outer blower fan, cause the heating capacity fluctuation very big, heating effect is undesirable, and waste of energy is very big.The speed of indoor motor can not realize stepless speed regulation, and heating effect is not good.And indoor motor do not arrange the cut-out circuit, easily motor caused damage when outage.
Summary of the invention
The present invention is the weak point that exists in the above-mentioned prior art for avoiding, and a kind of brushless electric machine air-conditioning system indoor motor control circuit is provided, with to any speed regulating control of indoor fan motor, obtain better heating effect.
The present invention be the technical solution problem by the following technical solutions.
Brushless electric machine air-conditioning system indoor motor control circuit, its design feature are to comprise that microcontroller U4, indoor dc fan motor rotating-speed control circuit, indoor motor speed governing voltage cut off circuit and temperature sensing circuit; Described indoor dc fan motor rotating-speed control circuit all is connected with described microcontroller with temperature sensing circuit; Described indoor motor speed governing voltage cuts off circuit and is connected with described indoor dc fan motor rotating-speed control circuit.
The design feature of brushless electric machine air-conditioning system indoor motor control circuit of the present invention also is:
Described indoor dc fan motor rotating-speed control circuit comprises resistance R 1～R6, electric capacity EC1～EC2, capacitor C 1, phase inverter U3, photoelectrical coupler U1, photoelectrical coupler U2 and voltage-stabiliser tube Z1; The PWM output port of described microcontroller U4 is connected with the input of resistance R 4 with photoelectrical coupler U1 by phase inverter U3 successively, the output of described photoelectrical coupler U1 is by resistance R 3 connection+15V power supplys, another output of described photoelectrical coupler U1 is connected the rotational speed regulation Vsp1 mouth of indoor dc fan motor, described capacitor C 1, electric capacity EC1, a link that is in parallel between resistance R 1 and the voltage-stabiliser tube Z1 after connecting is connected between the rotational speed regulation Vsp1 mouth and photoelectrical coupler U1 of indoor dc fan motor described capacitor C 1, electric capacity EC1, another link ground connection after connecting is in parallel between resistance R 1 and the voltage-stabiliser tube Z1; The speed feedback mouth FG1 of described indoor dc fan motor is connected with the input of described photoelectrical coupler U2, and another input of described photoelectrical coupler U2 is by resistance R 2 connection+15V power supplys; The output of described photoelectrical coupler U2 is connected with microcontroller U4 by resistance R 5; End after described resistance R 6 and electric capacity EC2 are in parallel and connect is connected between resistance R 5 and the microcontroller U4, described resistance R 6 and the electric capacity EC2 other end ground connection after being connected that is in parallel.
Described indoor motor speed governing voltage cuts off circuit and comprises that the first dividing potential drop shaping circuit, the first DC voltage testing circuit and Vsp1 voltage cut off circuit; The first dividing potential drop shaping circuit is made up of resistance R 21, resistance R 22 and electric capacity EC8; The first DC voltage testing circuit comprises voltage-stabiliser tube Z3, resistance R 23 and triode Q2; Vsp1 voltage cuts off circuit and comprises resistance R 24～R26, switch triode Q3, and wherein switch triode Q3 cuts off the executive component of circuit as Vsp1 voltage.
Described temperature sensing circuit comprises thermistor RT1, divider resistance R33 and commutation capacitor EC10; End connection+5V the power supply of described thermistor RT1, the other end of described thermistor RT1 connects microcontroller U4; End after described divider resistance R33 and commutation capacitor EC10 are in parallel and connect is connected between described thermistor RT1 and the microcontroller U4, described divider resistance R33 and the commutation capacitor EC10 other end ground connection after being connected that is in parallel.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1) brushless electric machine air-conditioning system indoor motor control circuit of the present invention because indoor fan motor has been adopted dc brushless motor, and is provided with rotating-speed control circuit, by closed-loop control, makes the stable and influence by voltage not of motor speed control, and noise is little; High temperature heats, under the low-temperature heating operating mode, the heating effect of air-conditioner is better.
2) brushless electric machine air-conditioning system indoor motor control circuit of the present invention; cut off circuit owing to be provided with indoor motor speed governing voltage Vsp1; apply in motor Vdm1 and Vcc1 voltage after making Vsp1 voltage; cut off prior to motor Vdm1 and Vcc1 voltage; it is simple to have solved the common air-conditioning DC motor control circuit; the flimsy disadvantage of motor can be protected indoor motor better, has improved safety in operation and the reliability of indoor motor.
4) brushless electric machine air-conditioning system indoor motor control circuit of the present invention makes air-conditioning system have the advantage that noise is low, heating effect is good, and working stability is reliable, the widening of the produce market that is highly advantageous to.
Brushless electric machine air-conditioning system indoor motor control circuit of the present invention has adopted dc brushless motor, can obtain better heating effect to any speed regulating control of indoor fan motor; Can also when outage, protect indoor fan motor, improve safety in operation and the reliability of indoor motor.
Description of drawings
Fig. 1 is the structural representation of dc brushless motor air-conditioning system of the present invention.
Fig. 2 is indoor dc fan motor rotating-speed control circuit schematic diagram of the present invention.
Fig. 3 is outdoor dc fan motor rotating-speed control circuit schematic diagram A(first circuit unit of air-conditioning system of the present invention).
Fig. 4 is the outdoor dc fan motor rotating-speed control circuit schematic diagram B(second circuit unit of air-conditioning system of the present invention).
Fig. 5 is outdoor direct current generator fixed rotating speed and the adjustable rotating speed commutation circuit schematic diagram of air-conditioning system of the present invention.
Fig. 6 is that the indoor motor speed governing voltage Vsp1 of air-conditioning system of the present invention cuts off circuit theory diagrams.
Fig. 7 is that the outdoor motor speed governing voltage Vsp2 of air-conditioning system of the present invention cuts off circuit theory diagrams.
Fig. 8 is the temperature sensing circuit schematic diagram of the indoor coil of air-conditioning system of the present invention.
Fig. 9 is the whole control circuit schematic diagram of air-conditioning system of the present invention.
Figure 10 is the conversion chart of the outdoor motor temperature-rotation speed relation of air-conditioning system of the present invention.
Label among Fig. 1～Figure 10: 1 compressor, 2 off-premises station heat exchangers, 3 aerofoil fans, 4 indoor set heat exchangers, 5 first capillaries, 6 axial-flow fans, 7 cross valves, 8 electric heaters, 9 gas-liquid separators, 10 check valves, 11 first stop valves, 12 second stop valves, 13 second capillaries.
Below pass through the specific embodiment, and the invention will be further described by reference to the accompanying drawings.
The specific embodiment
Referring to Fig. 9, brushless electric machine air-conditioning system indoor motor control circuit is characterized in that, comprises that microcontroller U4, indoor dc fan motor rotating-speed control circuit, indoor motor speed governing voltage cut off circuit and temperature sensing circuit; Described indoor dc fan motor rotating-speed control circuit all is connected with described microcontroller with temperature sensing circuit; Described indoor motor speed governing voltage cuts off circuit and is connected with described indoor dc fan motor rotating-speed control circuit.
The dc brushless motor air-conditioning system comprises indoor set, off-premises station and control circuit, its control circuit comprises that microcontroller U4, brushless electric machine air-conditioning system indoor motor control circuit of the present invention, outdoor dc fan motor rotating-speed control circuit, outdoor direct current generator fixed rotating speed and adjustable rotating speed commutation circuit, outdoor motor speed governing voltage cut off circuit such as circuit.The schematic diagram of indoor set and off-premises station is seen shown in Figure 1.Described indoor set comprises indoor set heat exchanger 4, electric heater 8 and axial-flow fan 6; One end of described indoor set heat exchanger 4 is connected with first stop valve 11, and the other end of described indoor set heat exchanger 4 is connected with second stop valve 12;
Described off-premises station comprises off-premises station heat exchanger 2, compressor 1, aerofoil fan 3, first capillary 5, cross valve 7, gas-liquid separator 9 and check valve 10; Described compressor 1 is connected with first port of described cross valve 7, second port of described cross valve 7 is connected with described first stop valve 11, the 3rd port of described cross valve 7 is connected with described gas-liquid separator 9, the 4th port of described cross valve 7 is connected with an end of described off-premises station heat exchanger 2, the other end of described off-premises station heat exchanger 2 is connected with an end of described first capillary 5, the other end of described first capillary 5 is connected with an end of described check valve 10, and the other end of described check valve 10 is connected with described second stop valve 12; One side of described off-premises station heat exchanger 2 is provided with aerofoil fan 3; The motor of the motor of described axial-flow fan 6 and described aerofoil fan 3 is brshless DC motor; The motor of the motor of the axial-flow fan 6 of described indoor set and the aerofoil fan 3 of described off-premises station is respectively by two control panel controls.
Described off-premises station also comprises second capillary 13; Described check valve 10 is in parallel with second capillary 13 and is connected.Be a kind of air-conditioning system of using dc brushless motor of the present invention as Fig. 1, constituted by indoor set, off-premises station, refrigeration system and corresponding control circuit.During refrigeration, low pressure, low-temperature refrigerant steam in the refrigeration system are sucked by compressor 1, drain into off-premises station heat exchanger 2 behind the compressed superheated steam for high pressure, high temperature; Simultaneously the outdoor air that sucks of the outside fan 3 off-premises station heat exchanger 2 of flowing through is taken away the cold-producing medium liberated heat, makes the refrigerant vapour of high pressure, high temperature be condensed into highly pressurised liquid.Highly pressurised liquid flows into indoor set heat exchanger 4 through first capillary, 5 step-downs cooling, and evaporates under corresponding low pressure, draws ambient heat; Simultaneously indoor fan 6 makes between the fin of machine heat exchanger 4 in the continuous inlet chamber of room air and carries out heat exchange, and is sent to the gas that turns cold after the heat release indoor.So, indoor-outdoor air constantly circulates, and reaches the purpose that reduces temperature.When heating, utilize the compression condensation heat of refrigeration system to heat room air, low pressure, low-temperature refrigerant liquid evaporate heat absorption in evaporimeter, and the heat release condensation in condenser of high-temperature high-pressure refrigerant gas.When heating, heat pump changes the loop direction of cold-producing medium by cross valve 7, become condenser when heating as the indoor set heat exchanger of evaporimeter when making original refrigeration work, originally become evaporimeter when heating as the off-premises station heat exchanger of condenser during refrigeration work, refrigeration system is in outdoor heat absorption like this, indoor heat release realizes the purpose that heats.Electric heater 8 is used for as assisted heating device.
Indoor, outdoor fan all adopts dc brushless motor, respectively by the control of two control panels, by closed-loop control, makes the stable and influence by voltage not of motor speed control, and noise is little; High temperature heats, under the low-temperature heating operating mode, the heating effect of air-conditioner is better.Outdoor motor adopts independent control circuit, makes the fixed rotating speed of outdoor motor and adjustable rotating speed arbitrarily to switch, again can be when closed loop rotating speed control loop damage, and outdoor fan continues operate as normal.
Adopt dc brushless motor, can obtain better heating effect to any speed regulating control of indoor fan motor; Indoor motor speed governing voltage cuts off circuit and can protect indoor fan motor when outage, has improved safety in operation and the reliability of indoor motor.
Described indoor dc fan motor rotating-speed control circuit comprises resistance R 1～R6, electric capacity EC1～EC2, capacitor C 1, phase inverter U3, photoelectrical coupler U1, photoelectrical coupler U2 and voltage-stabiliser tube Z1; The PWM output port of described microcontroller U4 is connected with the input of resistance R 4 with photoelectrical coupler U1 by phase inverter U3 successively, the output of described photoelectrical coupler U1 is by resistance R 3 connection+15V power supplys, another output of described photoelectrical coupler U1 is connected the rotational speed regulation Vsp1 mouth of indoor dc fan motor, described capacitor C 1, electric capacity EC1, a link that is in parallel between resistance R 1 and the voltage-stabiliser tube Z1 after connecting is connected between the rotational speed regulation Vsp1 mouth and photoelectrical coupler U1 of indoor dc fan motor described capacitor C 1, electric capacity EC1, another link ground connection after connecting is in parallel between resistance R 1 and the voltage-stabiliser tube Z1; The speed feedback mouth FG1 of described indoor dc fan motor is connected with the input of described photoelectrical coupler U2, and another input of described photoelectrical coupler U2 is by resistance R 2 connection+15V power supplys; The output of described photoelectrical coupler U2 is connected with microcontroller U4 by resistance R 5; End after described resistance R 6 and electric capacity EC2 are in parallel and connect is connected between resistance R 5 and the microcontroller U4, described resistance R 6 and the electric capacity EC2 other end ground connection after being connected that is in parallel.Be connected by plug connector CN1 between described indoor dc fan motor MOTOR1 and the described indoor dc fan motor rotating-speed control circuit, include splicing ears such as Vdm1, GND1, Vcc1, Vsp1 and FG1 on the described CN1.
As shown in Figure 2, indoor dc fan motor rotating-speed control circuit is made of speed feedback circuit and motor-drive circuit.The speed feedback circuit is made up of elements such as resistance R 2, R5, R6, photoelectrical coupler U2 and electric capacity EC2.Motor-drive circuit comprises elements compositions such as R1, R3, R4, photoelectrical coupler U1, electric capacity EC1, capacitor C 1, phase inverter U3 and voltage-stabiliser tube Z1.
Described speed feedback circuit with the built-in Hall element of indoor dc fan motor as the motor speed detection signal, the FG1 mouth of plug connector CN1 by indoor dc fan motor is sampled to photoelectrical coupler U2 input, through photoelectrical coupler U2 output, form signal transformation circuit via resistance R 5, R6, electric capacity EC2 and be input to microcontroller U4.With phase inverter U3 and the photoelectrical coupler U1 executive component as the control motor speed.Microcontroller U4 adjusts the output to the pulse signal frequency of phase inverter U3 in real time according to detected tach signal.The signal transformation circuit that the pulse of photoelectrical coupler U1 output is formed via resistance R 1, electric capacity EC1, C1 again forms motor driven voltage Vsp1 stably, is applied on the indoor motor MOTOR1.
The PWM output port of microcontroller U4 is the pwm pulse waveform of a little dutycycle of output earlier, through phase inverter U3, export by photoelectrical coupler U1, the DC voltage that forms certain amplitude behind resistance R 1, electric capacity EC1, the C1 shaping filter is added to the rotational speed regulation Vsp1 mouth of indoor motor MOTOR1, and voltage-stabiliser tube Z1 is set to prevent Vsp1 overtension damage motor at the Vsp1 mouth.After the indoor fan motor running, 12 pulse/commentaries on classics of Hall element HALL output of electric machine built-in, send into speed feedback mouth FG1, isolate output through photoelectrical coupler U2 again, be shaped as square wave by resistance R 5, R6, electric capacity EC2, send into microcontroller U4 external interrupt mouth, microcontroller U4 counts the pulse of sending into, thereby realizes the measurement to wind speed.And compare with the umber of pulse of the corresponding rotating speed of microcontroller U4 inner setting, adjust the dutycycle of PWM ripple.Can control the magnitude of voltage of Vsp1 mouth by the change of dutycycle, thus the rotating speed of motor M OTOR1 in the control room.
Described indoor motor speed governing voltage cuts off circuit and comprises that the first dividing potential drop shaping circuit, the first DC voltage testing circuit and Vsp1 voltage cut off circuit; The first dividing potential drop shaping circuit is made up of resistance R 21, resistance R 22 and electric capacity EC8; The first DC voltage testing circuit comprises voltage-stabiliser tube Z3, resistance R 23 and triode Q2; Vsp1 voltage cuts off circuit and comprises resistance R 24～R26, switch triode Q3, and wherein switch triode Q3 cuts off the executive component of circuit as Vsp1 voltage.
Fig. 6 is that indoor motor MOTOR1 speed governing voltage Vsp1 cuts off circuit, forms the first dividing potential drop shaping circuit by resistance R 21, R22 and electric capacity EC8, via voltage-stabiliser tube Z3, triode Q2 conduct+310V voltage detector component.Cut off the executive component of circuit as Vsp1 voltage with switch triode Q3.The prominent chance when cutting off the power supply before the Vdm1 and the cut-out of Vcc1 voltage of motor M OTOR1, cut off Vsp1 voltage earlier, is not damaged to protect indoor direct current generator MOTOR1.
Described temperature sensing circuit comprises thermistor RT1, divider resistance R33 and commutation capacitor EC10; End connection+5V the power supply of described thermistor RT1, the other end of described thermistor RT1 connects microcontroller U4; End after described divider resistance R33 and commutation capacitor EC10 are in parallel and connect is connected between described thermistor RT1 and the microcontroller U4, described divider resistance R33 and the commutation capacitor EC10 other end ground connection after being connected that is in parallel.
Fig. 8 is temperature sensing circuit, and the coil temperature sensor RT1 of indoor machine evaporation is set, with the temperature detection signal of the described coil temperature sensor RT1 changeover control signal as outdoor motor different rotating speeds shelves.
Fig. 2 and Fig. 6 have constituted complete indoor motor MOTOR1 control circuit, and the A node among Fig. 2 is connected with A node among Fig. 6.When air-conditioning normally in service, dash forward when meeting the situation of outage, because the characteristic of Switching Power Supply, the Vcc1 voltage of indoor motor MOTOR1 and the Vc voltage of microcontroller U4 all can keep just can disappearing in several seconds, and the Vdm1 voltage of indoor motor MOTOR1 can slowly descend, in these several seconds, because the decline of Vdm1 causes the rotating speed of indoor motor MOTOR1 to descend, thereby the umber of pulse that makes microcontroller U4 detect the feedback of indoor motor MOTOR1 reduces, microcontroller U4 can strengthen the dutycycle of output PWM ripple, cause Vsp1 voltage to raise, abnormal duty very likely causes the driver module of direct current generator MOTOR1 inside to damage.And cut off circuit, effectively head it off by motor M OTOR1 speed governing voltage Vsp1 is set.When Vdm1 voltage+310V just often, resistance R 21, R22 and electric capacity EC8 form the dividing potential drop shaping circuit, make voltage-stabiliser tube Z3, triode Q2 conducting, triode Q3 ends, and does not influence Vsp1 voltage, does not influence the operate as normal of motor.And in outage, when+when 310V voltage drops to a certain degree, when the voltage of getting on the resistance R 22 is lower than the voltage stabilizing value of voltage-stabiliser tube Z3, triode Q2 ends, triode Q3 saturation conduction, before the Vc voltage dead electricity of the Vcc1 of motor M OTOR1 voltage and microcontroller U4, Vsp1 mouth voltage is because of triode Q3 saturation conduction, voltage drops to 0V, thereby guarantees that direct current generator MOTOR1 is not damaged.
Dc brushless motor air-conditioning system control circuit comprises that microcontroller U4, brushless electric machine air-conditioning system indoor motor control circuit of the present invention, outdoor dc fan motor rotating-speed control circuit, outdoor direct current generator fixed rotating speed and adjustable rotating speed commutation circuit, outdoor motor speed governing voltage cut off circuit such as circuit.Described indoor dc fan motor rotating-speed control circuit, outdoor dc fan motor rotating-speed control circuit and temperature sensing circuit all are connected with described microcontroller; Described indoor motor speed governing voltage cuts off circuit and is connected with described indoor dc fan motor rotating-speed control circuit, and described outdoor motor speed governing voltage cuts off circuit and all is connected with described outdoor dc fan motor rotating-speed control circuit with adjustable rotating speed commutation circuit with outdoor direct current generator fixed rotating speed;
Described outdoor dc fan motor rotating-speed control circuit comprises first circuit unit and second circuit unit, and described first circuit unit comprises plug connector CN2, and described second circuit unit comprises plug connector CN4;
The circuit board of described dc brushless motor air-conditioning system control circuit is divided into outdoor control panel and indoor control panel; First circuit unit of described microcontroller U4, indoor dc fan motor rotating-speed control circuit, outdoor dc fan motor rotating-speed control circuit, indoor motor speed governing voltage cut off circuit and temperature sensing circuit is arranged on the described indoor control panel, and the second circuit unit of described outdoor dc fan motor rotating-speed control circuit, outdoor direct current generator fixed rotating speed and adjustable rotating speed commutation circuit and outdoor motor speed governing voltage cut off circuit and is arranged on the described outdoor control panel; Be connected with plug connector CN4 by plug connector CN2 between described outdoor control panel and the indoor control panel.
Be the integrated circuit figure of control circuit as Fig. 9, the circuit diagram of Fig. 9 combines the circuit diagram of Fig. 2～Fig. 8, and the circuit board of this control circuit is separated into two control panels: an indoor control panel and an outdoor control panel.Indoor, outdoor fan motor are all adopted dc brushless motor, and be provided with rotating-speed control circuit.When system only needs outdoor motor to adopt direct current generator and only needs a fixed rotating speed, on original control system, increasing so outdoor control panel again gets final product, need not former control system is done any change, and because outdoor motor fixed partial pressure resistance has adopted adjustable resistance ZW1, make it applicable to the system of any rotating speed requirement.And behind the indoor control panel and respective gut that so outdoor control panel are added among the present invention, can carry out the control of closed loop rotating speed to outdoor motor.Because fixed rotating speed and the adjustable rotating speed of outdoor motor control circuit can arbitrarily switch, again can be when closed loop rotating speed control loop damage, outdoor fan continues operate as normal.Solve the predicament of the corresponding a kind of new motor of system requirements of common fixed speed air conditioner, made applicability and the property capable of being combined of control circuit of this invention strengthen greatly, shortened product development cycle greatly, improved heating effect and job stability and reliability.
First circuit unit of described outdoor dc fan motor rotating-speed control circuit also comprises photoelectrical coupler U5, photoelectrical coupler U6, resistance R 7～R9, phase inverter U3 and electric capacity EC3; The output of described photoelectrical coupler U5 is connected with the terminal Vsp of described plug connector CN2, and the input of described photoelectrical coupler U5 is connected on the PWM output port of microcontroller U4 by resistance R 7 and phase inverter U3 successively; Two inputs of described photoelectrical coupler U6 are connected with terminal OUT-with the terminal FG of described plug connector CN2 respectively, and the output of described photoelectrical coupler U6 is connected with microcontroller U4 by resistance R 8; End after described resistance R 9 and electric capacity EC3 are in parallel and connect is connected between resistance R 8 and the microcontroller U4, described resistance R 9 and the electric capacity EC3 other end ground connection after being connected that is in parallel;
The second circuit unit of described outdoor dc fan motor rotating-speed control circuit also comprises resistance R 11～R16, electric capacity EC4, capacitor C 2, photoelectrical coupler U7, photoelectrical coupler U8 and voltage-stabiliser tube Z2, and the second circuit unit of described outdoor dc fan motor rotating-speed control circuit is connected with described outdoor dc fan motor MOTOR2 by plug connector CN3; The terminal Vsp of described plug connector CN4 is connected by the input of resistance R 16 with photoelectrical coupler U7, the output of described photoelectrical coupler U7 is by resistance R 14 connection+15V power supplys, and another output of described photoelectrical coupler U7 is connected the rotational speed regulation Vsp2 mouth of outdoor dc fan motor; A link that is in parallel between described capacitor C 2, electric capacity EC4, resistance R 11 and the voltage-stabiliser tube Z2 after connecting is connected between the rotational speed regulation Vsp2 mouth and photoelectrical coupler U7 of indoor dc fan motor, another link ground connection after the connection that is in parallel between described capacitor C 2, electric capacity EC4, resistance R 11 and the voltage-stabiliser tube Z2; The speed feedback mouth FG1 of described indoor dc fan motor is connected with the input of photoelectrical coupler U8 by resistance R 13, another input connection+15V power supply of described photoelectrical coupler U8; One end connection+15V power supply of described resistance R 12, the other end of described resistance R 12 are connected between the speed feedback mouth FG1 and described resistance R 13 of described indoor dc fan motor; The output of described photoelectrical coupler U8 is by resistance R 15 connection+15V power supplys, and another output of described photoelectrical coupler U8 is connected with the terminal FG of described plug connector CN4.
Be respectively two circuit units of outdoor dc fan motor rotating-speed control circuit as Fig. 3, Fig. 4, these two circuit units have constituted the outdoor motor rotating-speed control circuit jointly, its basic control principle is identical with the basic principle of above-mentioned indoor dc fan motor rotating-speed control circuit, and circuit structure is also similar.In order to make the present invention obtain better applicability, and the outdoor motor control circuit is divided into indoor (i.e. first circuit unit, shown in Figure 3), outdoor (be the second circuit unit, shown in Figure 4) two parts, the respective terminal of the plug connector of two circuit units can realize the connection of circuit after connecting by lead.
The plug connector CN2 of described first circuit unit and described second circuit unit comprise that plug connector CN4 includes 4 terminal: Vsp, FG, OUT-and IN-.The terminal of the same names of these two plug connectors is connected by lead, connector CN2 can be connected with CN4, thereby outdoor control panel can be connected with indoor control panel.Outdoor dc fan motor rotating-speed control circuit, with photoelectrical coupler U6, the U8 that can the isolate input/output terminal sampling element as the outdoor motor tach signal, with photoelectrical coupler U5, the U7 that can the isolate input/output terminal performer as the rotating speed of control outdoor motor MOTOR2.
Described plug connector CN3 also comprises terminal Vdm2 and terminal GND2; Described terminal Vdm2 is connected with+310V power supply by diode D1 and fuse F1 successively, and described terminal GND2 is connected with+310V power supply by LED 1 and resistance R 10 successively.Can show by LED 1 whether outdoor motor MOTOR2 connects power supply, implement protection by the outdoor motor MOTOR2 of fuse F1.
Described outdoor direct current generator fixed rotating speed and adjustable rotating speed commutation circuit comprise fixed partial pressure circuit and fixed partial pressure branch deenergizing; Described fixed partial pressure circuit comprises resistance R 17, adjustable resistance ZW1, electric capacity EC6 and positive-negative-positive triode Q1; Described fixed partial pressure branch deenergizing comprises photoelectrical coupler U9; Described triode Q1 is by resistance R 17 connections+15V power supplys, should+15V power supply and triode Q1 base stage between electrochemical capacitor EC5 of parallel connection; End after described adjustable resistance ZW1 and electric capacity EC6 are connected in parallel is connected between resistance R 17 and the triode Q1, the other end ground connection after described adjustable resistance ZW1 and electric capacity EC6 are connected in parallel.
Fig. 5 is outdoor direct current generator fixed rotating speed and adjustable rotating speed commutation circuit, is made of fixed partial pressure circuit and fixed partial pressure branch deenergizing.Described fixed partial pressure circuit is made up of resistance R 17, adjustable resistance ZW1, electric capacity EC6, positive-negative-positive triode Q1; The executive component that divides deenergizing with photoelectrical coupler U9 as fixed partial pressure.Electrochemical capacitor EC5 in parallel makes when connecting power supply between+15V power end and triode Q1 base stage, the motor driven voltage of fixed partial pressure circuit output slowly is applied on the outdoor motor MOTOR2, to avoid damaging motor.
Described outdoor motor speed governing voltage cuts off circuit and comprises that the second dividing potential drop shaping circuit, the second DC voltage testing circuit and Vsp2 voltage cut off circuit; The second dividing potential drop shaping circuit is made up of resistance R 27, resistance R 28 and electric capacity EC9; The second DC voltage testing circuit comprises voltage-stabiliser tube Z4, resistance R 29 and triode Q4; Vsp2 voltage cuts off circuit and comprises resistance R 30～R32, switch triode Q5, and wherein switch triode Q5 cuts off the executive component of circuit as Vsp2 voltage.
Fig. 7 is that outdoor motor MOTOR2 speed governing voltage Vsp2 cuts off circuit, and its basic control principle is with indoor dc fan motor rotating-speed control circuit.Via voltage-stabiliser tube Z4, triode Q4 conduct+310V voltage detector component.Cut off the executive component of circuit as Vsp2 voltage with switch triode Q5.The prominent chance when cutting off the power supply before the Vdm2 and the cut-out of Vcc2 voltage of outdoor motor MOTOR2, cut off Vsp2 voltage earlier, is not damaged to protect outdoor direct current generator MOTOR2.
Fig. 3, Fig. 4, Fig. 5, Fig. 7 have constituted the control circuit of complete outdoor motor MOTOR2, and wherein the power supply of outdoor control panel is docked with common automatically controlled plate with convenient by the outer blower fan signal control relay control of indoor control panel.CN2 among Fig. 3 has corresponding terminal with CN4 among Fig. 4, two parts circuit diagram can be linked together after corresponding terminal is connected, and two Node B are connected among the figure, and three node C are connected, and constitute complete circuit diagram, as shown in Figure 9.
After outdoor control panel powers on, at the connector CN2 of indoor control panel when connector CN4 on the outdoor control panel is not connected, then+bleeder circuit output voltage that 15V voltage is formed via resistance R 17, adjustable resistance ZW1, electric capacity EC6 is to the emitter-base bandgap grading of positive-negative-positive triode Q1, the base stage of triode Q1 is by resistance R 18, R19 and electric capacity EC7 ground connection, PN junction positively biased, triode Q1 conducting, the voltage that bleeder circuit is got is added to the Vsp2 mouth of outdoor motor MOTOR2, and motor M OTOR2 is turned round by a fixed rotating speed.Electric capacity EC5's+15V slowly charges by resistance R 18, R19; make slowly conducting of triode Q1; the voltage that is applied to the Vsp2 mouth slowly increases; thereby make slowly at the uniform velocity starting of motor M OTOR2; the setting of electric capacity EC5; make that Vdm2 and the Vcc2 voltage in motor M OTOR2 applies behind the Vsp2 voltage, meet the control of DC requirement, can effectively protect direct current generator MOTOR2 not to be damaged.The setting of adjustable resistance ZW1 can make outdoor control panel adapt to the rotating speed of arbitrary system requirements, and needn't redesign control panel and motor.
When the connector CN2 of indoor control panel be connected with connector CN4 on the outdoor control panel connect after, the pwm pulse waveform of the PWM mouth output of microcontroller U4, be connected to the 2nd pin (shown in Figure 3) of photoelectrical coupler U5 through phase inverter U3, R7, it is shown in Figure 5 that the output of optocoupler U5 the 3rd pin is connected to U9(through R16) the 1st pin, export from U9 the 3rd pin, give electric capacity EC7 charging, make the base voltage of triode Q1 be higher than emitter voltage, PN junction is anti-inclined to one side, triode Q1 ends, and has cut off the Vsp2 fixed partial pressure circuit of outdoor motor MOTOR2.
Simultaneously, the pwm pulse waveform of the PWM mouth output of microcontroller U4, through phase inverter U3, R7 is connected to the 2nd pin (shown in Figure 3) of photoelectrical coupler U5, it is shown in Figure 4 that the output of optocoupler U5 the 3rd pin is connected to U7(through R16) the 1st pin, export from U7 the 3rd pin, resistance R 11, electric capacity EC4, C2(is shown in Figure 4) DC voltage that forms certain amplitude behind the shaping filter is added to the rotational speed regulation Vsp2 mouth of outdoor motor MOTOR2, and at the Vsp2 mouth voltage-stabiliser tube Z2 is set and damages motor to prevent the Vsp2 overtension, after outdoor fan motor MOTOR2 running, 12 pulse/commentaries on classics of Hall element HALL output that motor M OTOR2 is built-in, send into speed feedback mouth FG2, shown in Figure 4 through photoelectrical coupler U8(again), U6(is shown in Figure 3) isolate and export, by resistance R 8, R9, electric capacity EC3(is shown in Figure 3) be shaped as square wave, send into microcontroller U4 external interrupt mouth, microcontroller U4 counts the pulse of sending into, carry out the measurement of the rotating speed of outdoor fan motor MOTOR2, thereby realize the measurement to the wind speed of outdoor fan.The umber of pulse of the corresponding rotating speed of the rotating speed of outdoor fan motor MOTOR2 and microcontroller U4 inner setting is compared, adjust the dutycycle of PWM ripple.Can control the magnitude of voltage of Vsp2 mouth by the change of dutycycle, thus the rotating speed of control room external fan motor M OTOR2.Shown in Figure 7, electric machine speed regulation voltage Vsp2 cuts off circuit, during outage, before the Vdm2 and the cut-out of Vcc2 voltage of motor, cuts off Vsp2 voltage earlier, and MOTOR2 is not damaged with the protection direct current generator.
According to shown in Figure 8, by at the indoor set heat exchanger coil temperature sensor being set, 5V voltage is by NTC thermistor and R33 dividing potential drop, EC10 shaping, voltage stabilizing, the variation of NTC thermistor RT1 resistance is converted to voltage change, and the output dc voltage signal is to the AD mouth of microcontroller U4.Microcontroller U4 comes perception indoor heat exchanger variation of temperature by AD conversion, the collection to this voltage, and air-conditioning heats under the situation, when heat exchange temperature changes, according to temperature-rotating speed transformational relation table of Figure 10, the rotating speed of outdoor motor is controlled.When temperature rises, during more than or equal to T3, one grade of outdoor fan rotating speed downward modulation, to SP3, during more than or equal to T5, the outdoor fan rotating speed is reduced one grade again, and to SP2, during more than or equal to T6, the outdoor fan rotating speed transfers to SP1; When temperature descended, during less than T4, the outdoor fan rotating speed raised one grade, and to SP2, during less than T2, the outdoor fan rotating speed raises one grade again, and to SP3, during less than T1, the outdoor fan rotating speed transfers to SP4.
In the temperature uphill process, if during more than or equal to T7, for preventing that compressor is because of high load capacity " jumping machine ", then turn-off the power supply of outdoor control panel, in case after turn-offing the power supply of outdoor control panel, when dropping to smaller or equal to T1 for giving the time of a decline of system loading, then need controlling temperature, allow again outdoor control panel again electric, repeat above-mentioned wind speed control procedure.
In concrete the enforcement, more gear outdoor motor rotating speed can also be set again, according to variations in temperature, when low-temperature heating, promote rotating speed, when high temperature is processed, reduce rotating speed.Reach always effectively heating the time when promoting low-temperature heating, the purpose of the heating capacity when lifting high temperature heats.
In split wall-hanging air conditioner KFRd-32GW/051-N1, KFRd-32GW/052-N1, KFRd-32GW/053-N1, KFRd-32GW/054-N1(1 level efficiency, when EER=3.6) experimentizing on the type, led module, two kinds of display modes of LED lamp are adopted in indoor demonstration respectively.According to experiment, refrigeration system is used original KFRd-32GW/054-E1(2 level efficiency, and EER=3.4) system does not change.During operate as normal, outdoor motor MOTOR2 rotating speed is arranged on 820 rev/mins, indoor fan MOTOR1, outdoor fan MOTOR2 all adopt dc brushless motor, adopt indoor, outdoor two control panels, outdoor control panel is by the outer blower fan control relay power supply of indoor control panel, outdoor motor MOTOR2 carries out closed-loop control by indoor control panel, after preventing that the closed-loop control circuit from damaging, the air-conditioning cisco unity malfunction, adjust the adjustable resistance ZW1 in the fixed partial pressure circuit, reach certain Vsp2 voltage, making fixed rotating speed is 820 rev/mins.
Heat in the process, when temperature rose, during more than or equal to 44 ℃, one grade of outdoor fan rotating speed downward modulation was to 720 rev/mins; During more than or equal to 46 ℃, outdoor fan MOTOR2 rotating speed is reduced one grade again, to 500 rev/mins; During more than or equal to 46 ℃, outdoor fan MOTOR2 rotating speed transfers to 300 rev/mins; When temperature descended, during less than 45 ℃, outdoor fan MOTOR2 rotating speed raised one grade, to 500 rev/mins; During less than 43 ℃, outdoor fan MOTOR2 rotating speed raises one grade again, to 700 rev/mins; During less than 41 ℃, outdoor fan MOTOR2 rotating speed transfers to 820 rev/mins.
In the temperature uphill process, if during more than or equal to 50 ℃, for preventing that compressor is because of high load capacity " jumping machine ", then turn-off the power supply of outdoor control panel, in case after turn-offing the power supply of outdoor control panel, when dropping to smaller or equal to 41 ℃ for giving the time of a decline of system loading, then need controlling temperature, allow again outdoor control panel again electric, repeat above-mentioned wind speed control procedure.
Evidence, on the basis of former KFRd-32GW/054-E1 system, directly Energy Efficiency Ratio EER is risen to more than 3.6, and when maximum heating capacity heated high load capacity by original average heating capacity 3200W(, outer blower fan frequent start-stop causes heating capacity fluctuation) brought up to 4600W.COP when high temperature heats is by originally significantly having improved winter heating's performance and environmental suitability.Product cost with do not adopt the KFRd-32GW/05-N1 type cost of direct current generator suitable, but reduced the volume of outer machine, reduced consumptions such as copper, aluminium, at packing, cost of transportation, noise, aspect of performance very big improvement is arranged all.Marketing, respond well.
The invention is not restricted to above description to embodiment, the content that those skilled in the art disclose according to the present invention, the improvement that on basis of the present invention, needn't carry out through creative work and revise all should be within protection scope of the present invention.
Claims (4)
1. brushless electric machine air-conditioning system indoor motor control circuit is characterized in that, comprises that microcontroller U4, indoor dc fan motor rotating-speed control circuit, indoor motor speed governing voltage cut off circuit such as circuit and temperature sensing circuit; Described indoor dc fan motor rotating-speed control circuit all is connected with described microcontroller with temperature sensing circuit; Described indoor motor speed governing voltage cuts off circuit and is connected with described indoor dc fan motor rotating-speed control circuit.
2. brushless electric machine air-conditioning system indoor motor control circuit according to claim 1, it is characterized in that described indoor dc fan motor rotating-speed control circuit comprises resistance R 1～R6, electric capacity EC1～EC2, capacitor C 1, phase inverter U3, photoelectrical coupler U1, photoelectrical coupler U2 and voltage-stabiliser tube Z1; The PWM output port of described central processing unit U4 is connected with the input of resistance R 4 with photoelectrical coupler U1 by phase inverter U3 successively, the output of described photoelectrical coupler U1 is by resistance R 3 connection+15V power supplys, another output of described photoelectrical coupler U1 is connected the rotational speed regulation Vsp1 mouth of indoor dc fan motor, described capacitor C 1, electric capacity EC1, a link that is in parallel between resistance R 1 and the voltage-stabiliser tube Z1 after connecting is connected between the rotational speed regulation Vsp1 mouth and photoelectrical coupler U1 of indoor dc fan motor described capacitor C 1, electric capacity EC1, another link ground connection after connecting is in parallel between resistance R 1 and the voltage-stabiliser tube Z1; The speed feedback mouth FG1 of described indoor dc fan motor is connected with the input of described photoelectrical coupler U2, and another input of described photoelectrical coupler U2 is by resistance R 2 connection+15V power supplys; The output of described photoelectrical coupler U2 is connected with microcontroller U4 by resistance R 5; End after described resistance R 6 and electric capacity EC2 are in parallel and connect is connected between resistance R 5 and the microcontroller U4, described resistance R 6 and the electric capacity EC2 other end ground connection after being connected that is in parallel.
3. brushless electric machine air-conditioning system indoor motor control circuit according to claim 1 is characterized in that, described indoor motor speed governing voltage cuts off circuit and comprises that the first dividing potential drop shaping circuit, the first DC voltage testing circuit and Vsp1 voltage cut off circuit; The first dividing potential drop shaping circuit is made up of resistance R 21, resistance R 22 and electric capacity EC8; The first DC voltage testing circuit comprises voltage-stabiliser tube Z3, resistance R 23 and triode Q2; Vsp1 voltage cuts off circuit and comprises resistance R 24～R26, switch triode Q3, and wherein switch triode Q3 cuts off the executive component of circuit as Vsp1 voltage.
4. according to claim 1,2 and 3 described brushless electric machine air-conditioning system indoor motor control circuits, it is characterized in that described temperature sensing circuit comprises thermistor RT1, divider resistance R33 and commutation capacitor EC10; End connection+5V the power supply of described thermistor RT1, the other end of described thermistor RT1 connects microcontroller U4; End after described divider resistance R33 and commutation capacitor EC10 are in parallel and connect is connected between described thermistor RT1 and the microcontroller U4, described divider resistance R33 and the commutation capacitor EC10 other end ground connection after being connected that is in parallel.
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| CN105024592A (en) * | 2014-04-25 | 2015-11-04 | 中山大洋电机股份有限公司 | BLDC motor fault state feedback method and application BLDC motor, air-conditioning system |
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| CN110454946A (en) * | 2019-08-13 | 2019-11-15 | 江苏群达智能科技有限公司 | A kind of fan speed regulation method that universal convertible frequency air-conditioner control panel uses |
| CN116857216A (en) * | 2023-07-05 | 2023-10-10 | 安徽尚特杰电力技术有限公司 | Multi-fan fault detection circuit and method |
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Address after: 239000 No. 585, Shanghai Road, Chengdong Industrial Park, Chuzhou economic and Technological Development Zone, Anhui Patentee after: Anhui Yangzi Air Conditioning Co., Ltd Address before: 239000 No. 585, Shanghai Road, Chengdong Industrial Park, Chuzhou economic and Technological Development Zone, Anhui Patentee before: CHINA YANGZI GROUP CHUZHOU YANGZI AIR CONDITIONER Co.,Ltd. |
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